Cap for electronic pen



FIG. 1 is a perspective view of a cap for electronic pen showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a left side view thereof.

The broken lines in FIG. 5 are for environmental purposes only and form no part of the claimed design. 

The ornamental design for a cap for electronic pen, as shown and described. 